initial commit

src/kern/log.zig

@@ -0,0 +1,57 @@
+const std = @import("std");
+const b = @import("base");
+const pl = b.pl;
+const ke = b.ke;
+
+pub var debug_lock = ke.SpinLock.init();
+
+pub fn print(bytes: []const u8) void {
+    for (bytes) |c| {
+        pl.debug_write(c);
+    }
+}
+
+const LogWriter = struct {
+    interface: std.Io.Writer,
+
+    pub fn init() LogWriter {
+        return .{
+            .interface = .{
+                .vtable = &.{ .drain = drain },
+                .buffer = &.{},
+                .end = 0,
+            },
+        };
+    }
+
+    fn drain(_: *std.Io.Writer, data: []const []const u8, _: usize) std.Io.Writer.Error!usize {
+        var total_written: usize = 0;
+        for (data) |slice| {
+            print(slice);
+            total_written += slice.len;
+        }
+
+        return total_written;
+    }
+};
+
+pub fn log(
+    comptime level: std.log.Level,
+    comptime scope: @EnumLiteral(),
+    comptime fmt: []const u8,
+    args: anytype,
+) void {
+    _ = level;
+    _ = scope;
+
+    const ipl = debug_lock.acquire();
+
+    var writer = LogWriter.init();
+
+    writer.interface.print(
+        fmt ++ "\r\n",
+        args,
+    ) catch unreachable;
+
+    debug_lock.release(ipl);
+}